Biogeochemistry最新文献

{"title":"Subtropical stormwater ponds are more frequently net nitrogen fixing compared to natural ponds","authors":"Audrey H. Goeckner,&nbsp;Ashley R. Smyth,&nbsp;Meredith A. Holgerson,&nbsp;Alexander J. Reisinger","doi":"10.1007/s10533-024-01153-z","DOIUrl":"10.1007/s10533-024-01153-z","url":null,"abstract":"<div><p>Urban stormwater ponds (SWPs) are engineered ecosystems designed to prevent flooding and protect downstream ecosystems by retaining nutrients associated with stormwater runoff, including nitrogen (N). Despite these expectations, multiple studies have found that SWPs have low N removal efficiencies and can be sources of N to downstream ecosystems. To understand mechanisms controlling the fate of N in SWPs, we quantified dinitrogen (N₂) gas saturation to characterize net N₂ exchange as either net denitrification or net N-fixation. We assessed temporal and spatial patterns of N₂ dynamics in fifteen SWPs and six naturally occurring ponds in undisturbed watersheds (Florida, USA) by sampling in two seasons (dry and wet) and from multiple depths of the water column. Samples from SWPs were equally likely to exhibit N₂ supersaturation (net denitrification; 50%) or undersaturation (net N-fixation; 50%). In contrast, the majority (82%) of samples from natural ponds were supersaturated with N₂, indicating net denitrification. The mean SWP air–water N₂ flux was − 1.7 μg N₂-N m⁻² h⁻¹ (range − 500 to 433 μg N₂-N m⁻² h⁻¹), which was lower than clear (40 μg N₂-N m⁻² h⁻¹; range − 68 to 74 μg N₂-N m⁻² h⁻¹) and humic (202 μg N₂-N m⁻² h⁻¹; range 41 to 407 μg N₂-N m⁻² h⁻¹) natural ponds despite considerably higher variation in SWPs. These results indicate that SWPs may have low N removal efficiencies in part due to N-fixation adding new N to the system. Overall, this study shows that SWPs are less effective than natural ponds at removing reactive N from the environment, potentially impacting downstream water quality.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 8","pages":"1007 - 1024"},"PeriodicalIF":3.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01153-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141315572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Persistent and lagged effects of fire on stream solutes linked to intermittent precipitation in arid lands","authors":"Heili Lowman,&nbsp;Joanna Blaszczak,&nbsp;Ashley Cale,&nbsp;Xiaoli Dong,&nbsp;Stevan Earl,&nbsp;Julia Grabow,&nbsp;Nancy B. Grimm,&nbsp;Tamara K. Harms,&nbsp;John Melack,&nbsp;Ann Marie Reinhold,&nbsp;Betsy Summers,&nbsp;Alex J. Webster","doi":"10.1007/s10533-024-01154-y","DOIUrl":"10.1007/s10533-024-01154-y","url":null,"abstract":"<div><p>Increased occurrence, size, and intensity of fire result in significant but variable changes to hydrology and material retention in watersheds with concomitant effects on stream biogeochemistry. In arid regions, seasonal and episodic precipitation results in intermittency in flows connecting watersheds to recipient streams that can delay the effects of fire on stream chemistry. We investigated how the spatial extent of fire within watersheds interacts with variability in amount and timing of precipitation to influence stream chemistry of three forested, montane watersheds in a monsoonal climate and four coastal, chaparral watersheds in a Mediterranean climate. We applied state-space models to estimate effects of precipitation, fire, and their interaction on stream chemistry up to five years following fire using 15 + years of monthly observations. Precipitation alone diluted specific conductance and flushed nitrate and phosphate to Mediterranean streams. Fire had positive and negative effects on specific conductance in both climates, whereas ammonium and nitrate concentrations increased following fire in Mediterranean streams. Fire and precipitation had positive interactive effects on specific conductance in monsoonal streams and on ammonium in Mediterranean streams. In most cases, the effects of fire and its interaction with precipitation persisted or were lagged 2–5 years. These results suggest that precipitation influences the timing and intensity of the effects of fire on stream solute dynamics in aridland watersheds, but these responses vary by climate, solute, and watershed characteristics. Time series models were applied to data from long-term monitoring that included observations before and after fire, yielding estimated effects of fire on aridland stream chemistry. This statistical approach captured effects of local-scale temporal variation, including delayed responses to fire, and may be used to reduce uncertainty in predicted responses of water quality under changing fire and precipitation regimes of arid lands.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"777 - 791"},"PeriodicalIF":3.9,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01154-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141287134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rewetting effects on nitrogen cycling and nutrient export from coastal peatlands to the Baltic Sea","authors":"Anne Breznikar,&nbsp;Daniel L. Pönisch,&nbsp;Marvin Lorenz,&nbsp;Gerald Jurasinski,&nbsp;Gregor Rehder,&nbsp;Maren Voss","doi":"10.1007/s10533-024-01149-9","DOIUrl":"10.1007/s10533-024-01149-9","url":null,"abstract":"<div><p>Coastal nutrient loads from point sources such as rivers are mostly well-monitored. This is not the case for diffuse nutrient inputs from coastal catchments unconnected to rivers, despite the potential for high inputs due to intensive land use. The German Baltic Sea coastline consists of numerous peatlands that have been diked and drained. However, some of the dikes have been removed in order to re-establish the hydrological connection to the Baltic Sea, restore local biodiversity, and promote natural CO₂ uptake. Since these peatlands were used for agriculture, their rewetting may release accumulated nutrients, leading to nutrient export into the Baltic Sea and intensified coastal eutrophication. Data on these potential nutrient exports are mostly lacking. Therefore, this study investigated nutrient exports from two former agricultural, coastal peatlands: Drammendorfer Wiesen, rewetted in 2019, and Karrendorfer Wiesen, rewetted in 1993. Nutrients (NO₃^–, NO₂^–, NH₄⁺, PO₄^3–), nitrous oxide (N₂O), particulate organic matter (POM, comprising POC and PON; δ¹³C-POC), chlorophyll-<i>a,</i> and nitrification rates were analyzed in surface water and porewater sampled weekly to monthly in 2019 and 2020 to compare the effects of different time scales after rewetting on nutrient cycling and potential exports. NH₄⁺, NO₂⁻, and PO₄³⁻ concentrations were higher in the porewater than in the overlying water at both sites, while nutrient concentrations were generally higher at the recently rewetted Drammendorfer Wiesen than at the Karrendorfer Wiesen. NO₃⁻ concentrations in porewater, however, were lower than in the overlying water, indicating NO₃⁻ retention within the peat, likely due to denitrification. Nitrification rates and N₂O concentrations were generally low, except for a high N₂O peak immediately after rewetting. These results suggest that denitrification was the dominant process of N₂O production at the study sites. Both peatlands exported nutrients to their adjacent bays of the Baltic Sea; however, N exports were 75% lower in the longer-rewetted peatland. Compared to major Baltic Sea rivers, both sites exported larger area-normalized nutrient loads. Our study highlights the need to monitor the impact of rewetting measures over time to obtain accurate estimates of nutrient exports, better assess negative effects on coastal waters, and to improve peatland management.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 7","pages":"967 - 987"},"PeriodicalIF":3.9,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01149-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141251713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulated plant-mediated oxygen input has strong impacts on fine-scale porewater biogeochemistry and weak impacts on integrated methane fluxes in coastal wetlands","authors":"Yongli Zhou,&nbsp;Teri O’Meara,&nbsp;Zoe G. Cardon,&nbsp;Jiaze Wang,&nbsp;Benjamin N. Sulman,&nbsp;Anne E. Giblin,&nbsp;Inke Forbrich","doi":"10.1007/s10533-024-01145-z","DOIUrl":"10.1007/s10533-024-01145-z","url":null,"abstract":"<div><p>Methane (CH₄) emissions from wetland ecosystems are controlled by redox conditions in the soil, which are currently underrepresented in Earth system models. Plant-mediated radial oxygen loss (ROL) can increase soil O₂ availability, affect local redox conditions, and cause heterogeneous distribution of redox-sensitive chemical species at the root scale, which would affect CH₄ emissions integrated over larger scales. In this study, we used a subsurface geochemical simulator (PFLOTRAN) to quantify the effects of incorporating either spatially homogeneous ROL or more complex heterogeneous ROL on model predictions of porewater solute concentration depth profiles (dissolved organic carbon, methane, sulfate, sulfide) and column integrated CH₄ fluxes for a tidal coastal wetland. From the heterogeneous ROL simulation, we obtained 18% higher column averaged CH₄ concentration at the rooting zone but 5% lower total CH₄ flux compared to simulations of the homogeneous ROL or without ROL. This difference is because lower CH₄ concentrations occurred in the same rhizosphere volume that was directly connected with plant-mediated transport of CH₄ from the rooting zone to the atmosphere. Sensitivity analysis indicated that the impacts of heterogeneous ROL on model predictions of porewater oxygen and sulfide concentrations will be more important under conditions of higher ROL fluxes or more heterogeneous root distribution (lower root densities). Despite the small impact on predicted CH₄ emissions, the simulated ROL drastically reduced porewater concentrations of sulfide, an effective phytotoxin, indicating that incorporating ROL combined with sulfur cycling into ecosystem models could potentially improve predictions of plant productivity in coastal wetland ecosystems.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 7","pages":"945 - 963"},"PeriodicalIF":3.9,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01145-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141092040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Seasonal fluctuations of extracellular enzyme activities are related to the biogeochemical cycling of C, N and P in a tropical terra-firme forest","authors":"Karst J. Schaap,&nbsp;Lucia Fuchslueger,&nbsp;Carlos Alberto Quesada,&nbsp;Florian Hofhansl,&nbsp;Oscar Valverde-Barrantes,&nbsp;Plínio B. Camargo,&nbsp;Marcel R. Hoosbeek","doi":"10.1007/s10533-024-01148-w","DOIUrl":"10.1007/s10533-024-01148-w","url":null,"abstract":"","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"889 - 893"},"PeriodicalIF":3.9,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01148-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141079409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correction to: Terrestrial and marine POC export fluxes estimated by 234Th–238U disequilibrium and δ13C measurements in the East China Sea shelf","authors":"Qiangqiang Zhong,&nbsp;Dekun Huang,&nbsp;Qiugui Wang,&nbsp;Jinzhou Du,&nbsp;Fule Zhang,&nbsp;Jing Lin,&nbsp;Tao Yu","doi":"10.1007/s10533-024-01152-0","DOIUrl":"10.1007/s10533-024-01152-0","url":null,"abstract":"","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"829 - 830"},"PeriodicalIF":3.9,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01152-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142412658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unearthing the legacy of wildfires: post fire pyrogenic carbon and soil carbon persistence across complex Pacific Northwest watersheds","authors":"Hayley Peter-Contesse,&nbsp;Kate Lajtha,&nbsp;Aron Boettcher,&nbsp;Regina O’Kelley,&nbsp;Amy Mayedo","doi":"10.1007/s10533-024-01151-1","DOIUrl":"10.1007/s10533-024-01151-1","url":null,"abstract":"<div><p>Wildfires have the potential to dramatically alter the carbon (C) storage potential, ecological function, and the fundamental mechanisms that control the C balance of Pacific Northwest (PNW) forested ecosystems. In this study, we explored how wildfire influences processes that control soil C stabilization and the consequent soil C persistence, and the role of previous fire history in determining soil C fire response dynamics. We collected mineral soils at four depth increments from burned (low, moderate, and high soil burn severity classes) and unburned areas and surveyed coarse woody debris (CWD) in sites within the footprint of the 2020 Holiday Farm Fire and in surrounding Willamette National Forest and the H.J. Andrews Experimental Forest. We found few changes in overall soil C pools as a function of fire severity; we instead found that unburned sites contained high levels of pyrogenic C (PyC) that were commensurate with PyC concentrations in the high severity burn sites—pointing to the high background rate of fire in these ecosystems. An analysis of historical fire events lends additional support, where increasing fire count is loosely correlated with increasing PyC concentration. An unexpected finding was that PyC concentration was lower in low soil burn severity sites than in control sites, which we attribute to fundamental ecological differences in regions that repeatedly burn at high severity compared with those that burn at low severity. Our CWD analysis showed that high mean fire return interval (decades between fire events) was strongly correlated with low annual CWD accumulation rate; whereas areas that burn frequently had a high annual CWD accumulation rate. Within the first year postfire, trends in soil density fractions demonstrated no significant response to fire for the mineral-associated organic matter pool but slight increases in the particulate pool with increasing soil burn severity—likely a function of increased charcoal additions. Overall, our results suggest that these PNW forest soils display complex responses to wildfire with feedbacks between CWD pools that provide varying fuel loads and a mosaic fire regime across the landscape. Microclimate and historic fire events are likely important determinants of soil C persistence in these systems.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 7","pages":"927 - 944"},"PeriodicalIF":3.9,"publicationDate":"2024-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01151-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140954236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soil C:N:P stoichiometric signatures of grasslands differ between tropical and warm temperate climatic zones","authors":"Ángel Héctor Hernández-Romero,&nbsp;Yareni Perroni,&nbsp;Lázaro Rafael Sánchez Velásquez,&nbsp;Sergio Martínez-Hernández,&nbsp;Carlos Héctor Ávila-Bello,&nbsp;Xiaofeng Xu,&nbsp;Lihua Zhang","doi":"10.1007/s10533-024-01143-1","DOIUrl":"10.1007/s10533-024-01143-1","url":null,"abstract":"<div><p>Climate and land management affect nutrient cycling in grassland ecosystems. We aimed to understand whether temperate and tropical grasslands differ in terms of soil organic carbon (SOC), nitrogen (N), and phosphorus (P) concentrations, and their C:N:P stoichiometric ratios in grazed and ungrazed natural grasslands and pastures. For this, we used a meta-analysis approach (1296 records, 241 papers), and regression models to explain the observed patterns in terms of mean annual precipitation (MAP), mean annual temperature (MAT), altitude, and latitude. SOC, N, and P concentrations were higher in temperate regions than in tropical ones, and they negatively correlated with MAT and MAP. The grassland type effect was more significant for tropical regions. In tropical regions, soil C:N ratios were higher in ungrazed than in grazed pastures, and soil N:P ratios in ungrazed sites were higher in pastures than in natural grasslands. Grazing increases soil N and SOC for natural grasslands in temperate regions. Our findings suggest that soil stoichiometric C:N:P stoichiometric signatures in grasslands differed between tropical and temperate regions on a global scale. P is a key element in regulation and restriction on soil C and N cycling in tropical regions but less in the temperate ones. Our findings suggest the direction of effects of grazing or grassland type on C:N:P stoichiometric signature. Since imbalances in soil stoichiometric ratios may have implications for ecosystem functioning, the assessment of these patterns could serve as a valuable tool for management and conservation of grasslands and pastures in both tropical and temperate regions.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 7","pages":"909 - 926"},"PeriodicalIF":3.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01143-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Soil gross N2O emission and uptake under two contrasting agroforestry systems: riparian tree buffer versus alley-cropping tree row","authors":"Jie Luo,&nbsp;Lukas Beule,&nbsp;Guodong Shao,&nbsp;Dan Niu,&nbsp;Edzo Veldkamp,&nbsp;Marife D. Corre","doi":"10.1007/s10533-024-01141-3","DOIUrl":"10.1007/s10533-024-01141-3","url":null,"abstract":"<div><p>In addition to the removal of excess mineral nitrogen (N) via root uptake, trees in agroforestry systems may mitigate negative effects of high N fertilization of adjacent crops by enhancing complete denitrification of excess mineral N aside from root uptake. Presently, little is known about the potential for NO₃⁻ reduction through denitrification (conversion to greenhouse gas N₂O and subsequently to non-reactive N₂) in contrasting agroforestry systems: riparian tree buffer versus tree row of an upland alley-cropping system. Our study aimed to (1) quantify gross N₂O emissions (both N₂O + N₂ emissions) and gross N₂O uptake (N₂O reduction to N₂), and (2) determine their controlling factors. We employed the ¹⁵N₂O pool dilution technique to quantify gross N₂O fluxes from 0 to 5 cm (topsoil) and 40 to 60 cm (subsoil) depths with seasonal field measurements in 2019. The riparian tree buffer exhibited higher topsoil gross N₂O emissions and uptake than the alley-cropping tree row (<i>P</i> &lt; 0.03). Gross N₂O emissions were regulated by N and carbon (C) availabilities and aeration status rather than denitrification gene abundance. Gross N₂O uptake was directly linked to available C and <i>nirK</i> gene abundance. In the subsoil, gross N₂O emission and uptake were low in both agroforestry systems, resulting from low mineral N contents possibly due to N uptake by deep tree roots. Nonetheless, the larger available C and soil moisture in the subsoil of riparian tree buffer than in alley-cropping tree row (<i>P</i> &lt; 0.05) suggest its large potential for N₂O uptake whenever NO₃⁻ is transported to the subsoil.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"871 - 888"},"PeriodicalIF":3.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01141-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the spatiotemporal variability of dissolved organic matter fluorescence composition in the Lake George, NY watershed","authors":"Aleksandar I. Goranov,&nbsp;Mark W. Swinton,&nbsp;David A. Winkler,&nbsp;Jeremy L. Farrell,&nbsp;Sandra A. Nierzwicki-Bauer,&nbsp;Sasha Wagner","doi":"10.1007/s10533-024-01147-x","DOIUrl":"10.1007/s10533-024-01147-x","url":null,"abstract":"<div><p>Lake George (LG) is a temperate, oligotrophic, medium-sized lake (114 km²) located in northeastern New York State (U.S.). Lakes are highly understudied environments where extensive dissolved organic matter (DOM) processing occurs. With this study we establish the foundation for researching the organic biogeochemistry of the LG watershed, in particular, the numerous tributaries flowing into the lake. Collected were 213 samples from 64 tributaries and 12 lake locations. Some of the tributaries had unique wastewater, agricultural, or wetland influences. We employed fluorescence spectroscopy, a common biogeochemical technique, to characterize the fluorescent DOM (FDOM) component. We developed a parallel factor analysis (PARAFAC) model for the deconvolution of FDOM data allowing to depict six underlying FDOM constituents, which varied in source and biogeochemical reactivity on spatiotemporal scales. Tributary DOM, in comparison to lake DOM, was much more aromatic, of larger molecular weight, more humic, and contained less protein-like material. The distribution of humic and protein-like PARAFAC components was impacted by land-use and wastewater influences. Supporting characterization of the chromophoric DOM (CDOM) and total DOM (on dissolved organic carbon basis) allowed differentiating the influence of wetlands, which could not be depicted by spatiotemporally assessing the variability of PARAFAC components. Temporal assessment revealed minor variabilities in tributary DOM quantity and quality except in cases of point sources such as wastewater treatment facilities. Overall, this primer study establishes baseline understanding of the baseflow levels of DOM constituents in the LG watershed, and more broadly, presents a PARAFAC model for the deconvolution of fluorescence spectra of DOM from temperate and oligotrophic lake watersheds such as LG.</p></div>","PeriodicalId":8901,"journal":{"name":"Biogeochemistry","volume":"167 6","pages":"849 - 870"},"PeriodicalIF":3.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10533-024-01147-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140925193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}